
//***********************************************
//
//      Filename: pp31.java
//
//        Author: wwb
//        Mails: 1274860621@qq.com
//        Create: 2018-03-22 20:43:01
// Last Modified: 2018-03-22 20:43:01
//***********************************************
       import java.util.Scanner;
       
     public class pp31
   {
    public static void main(String[] args)
    {
       String 
